Crucible-furnace or the like.



V w. BUESS.

OBUGIBLE FURNACE OR THE LIKE.

APPLIOATIbN I ILED NOV. 17, 1910.

Patented Ma. 28, 1911 l/VVE IV TOR Wilk all, j es s,

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WILHELM BUESS, OF HANOVER, GERMANY.

CRUCIBLE-FURNACE OR THE LIKE.

Specification of Letters Patent.

Application filed November 17, 1910.

Patented Mar. 28, 1211. Serial No. 592,772.

To all whom it may concern:

Be it known that I, VVILi-IELM Bunss, a citizen of the German Empire, and residing at Hanover, in the Province of Hanover and Empire of Germany, have invented certain new and useful Improvements in or Relating to CrucibleFurnaces or the Like, of which the following is a specification.

This invention relates to smelting furnaces of the type wherein liquid or gaseous fuel is employed, the crucible containing the metal to be melted resting on the bottom of the furnace. Such furnaces comprise a fire proof easing provided with a removable top and have one or more openings in their wall through which the flames and products of combustion impinge against the crucible.

According to this invention a novel mechanism is provided for raising the cover of the furnace and swinging the same to one side.

In the accompanying drawings :Figure l is a vertical section through a furnace adapted to tilt, Fig. 2 is a plan of the furnace shown in Fig. 1, and Fig. 3 a side elevation thereof.

The casing of the furnace is marked 1, the bottom of the furnace 7 and the supporting brackets 011 both sides 8. The casing which is mounted so as to tip in bearings 11 formed in the supports or brackets 8 has a bottom made of refractory material supported by a metal plate 12. The plate 12 is detachably secured to the outer wall of thefurnace by means of screws passing through angular flanges on the plate and furnace the arrangement being such that when the screws are removed the bottom together with the cooling chamber formed below it, can be bodily detached to facilitate repairs or adjustment.

The cover or lid 13 closing the upper portion of the furnace is raised and at the same time swung to the side by means of mechanism hereinafter described, for the purpose of giving access to the interior of the furnace. The casing, top and base thus form a heating chamber and within it is disposed the melting crucible. The furnace is supplied with fuel in the form of finely divided crude oil or the like mixed with compressed air this charge being admitted through a nozzle 1a. The oil supply pipe 15 (Fig. 8) provided with a regulating cock and the compressed air pipe 16 also provided with a regulating cock, lead to this nozzle.

To reduce as far as possible the destructive influence of the flames on the bottom of the heating chamber, according to this invention an air cooling chamber 17 is provided on the lower surface of the bottom and connected to the iron plate 12 constituting the base proper. Compressed air is employed as cooling agent, this being introduced and discharged in the direction of the arrows in Fig. 1 through the pipes 18. As will be seen, the pipes pass through the axis of rotation of the furnace, so that whatever be the position of the latter, the supply of cooling air is still maintained. It is preferable to provide in the interior of the cooling chamber 17 special baflle plates 19 to divide the air current admitted and insure its thorough circulation.

The air heated in the interior of the cooling chamber by the heat given off by the bottom 7 can be utilized for supplying the nozzle 14. To that end, as shown in Fig. 3, the pipe 16 leading to the nozzle 14 is connected to the pipe 18 and thus a great quantity of heat which would otherwise be wasted is utilized in an eflicient manner.

For raising and swinging the cover the following mechanism is used :The cover is supported on the bifurated arm 20 of a vertical rod 21 in such a manner that it can be completely turned back about the pins 22 into the open position shown in dotted lines. The bottom portion of the bracket 21 is rotatable within a stationary hollow standard 23 and is capable of adjustment having a toothed rack formed along a certain portion of its length, the teeth being provided on all sides as shown in Fig. 1. With the rack thus formed a pinion 25 (Fig. 2) engages, operated by means of a hand wheel 24, so that when the latter is rotated, the bracket, and consequently the cover, are raised or lowered. To produce simultaneously with the raising of the cover a lateral swinging of the same, according to this invention the rod 21 has a pin 26 (Fig. 3) projecting from it preferably carrying a roller. The pin and its roller are guided in a curved slot 27 in such a manner that the rod 21 in rising must at the same time make a rotation which corresponds to the total amount of the swinging. Moreover, a device is provided by means of which the cover, before it is raised by the mechanism described and swung laterally, is somewhat lifted about the pin 22 in order that subsequently, in the freely suspended open position, it should be slightly inclined relatively to the horizontal and could be placed again on the furnace edge if desired in case of any considerable sinking owing to its gravity. T 0 that end, the cover is suspended by means of chains 28 (the tension of which is regulated by means of tension sleeves 29 with right and left hand screw-thread) those chains passing over an eccentric disk 30 (Fig. 1) rotatably mounted in an upward extension of the rod 21. The chains 28 are combined into a single chain where they are guided over the eccentric 30 and are connected to a bolt 31 mounted on the rear surface of the rod 21. The eccentric 30 is rigidly connected to a bifurcated lever 32 and when the latter is rotated the chains are tightened and the cover is thus lifted.

For bringing about the tipping movement of the furnace, for the purpose of emptying the crucible, a worm wheel 33 is used this wheel being keyed to one of the trunnions of the furnace, and engaged by a worm 34 which can be rotated by means of a hand wheel.

I claim:

1. A device of the character described, comprising a crucible furnace, a cover therefor, means for lifting the cover, and automatic means for simultaneously swinging the cover in a horizontal plane.

2. A device of the character described,

comprising a crucible furnace, a cover therefor, a rod connected to the cover, means for vertically lifting the rod, a sleeve surrounding the rod, and having a curved slot, and a pin on the rod that engages said slot.

3. A device of the character described, comprising a crucible furnace, a cover therefor, a toothed rod connected to the cover, a pinion engaging the rod, a sleeve surrounding the rod and having a curved slot, and a pin on the rod that engages said slot.

f. A device of the character described, comprising a crucible furnace, a cover therefor, a rod to which the cover is hinged, means for vertically lifting the rod, automatic means for simultaneously swinging the cover in a horizontal plane, and separate means for tilting the cover on the rod.

5. A device of the character described, comprising a crucible furnace, a cover therefor, a rod to which the cover is hinged, means for vertically lifting the rod, automatic means for simultaneously swinging the cover in a horizontal plane, a manually operable eccentric pivoted to the rod, and a chain secured to the cover and engaging said eccentric.

In testimony whereof I affiX my signature in presence of two witnesses.

I WILHELM BUESS. l/Vitnesses:

NOAH. GoLDvBonnr, M. BEI-INE.

Copies of this patent may be obtained for five cents each, by addressing the.0on1missioner of Patents, Washington, D. C. 

